You may not be getting any low-frequency information for the surrounds from PLII. With the mains and center set to large, the bass from those channels will not be crossed over to the sub (the crossover settings for those channels is ignored, basically). To check, just switch your center or mains to small and try again.

I haven't looked to see if mine has a red dot, but the e-mail newsletter said it would be on the label -- I'd check near the serial number on the back (top right corner of the back).

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review